Malicious PDF — malware analysis report

Static analysis result for SHA-256 168d13b9a79271e5…

MALICIOUS

PDF

39.3 KB Created: 2021-07-06 00:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f40f3987ebe41099ab973e143e0159ea SHA-1: 8177e0bb40105223edab23e96e0a02d8936f2f7a SHA-256: 168d13b9a79271e567a070190530ea59b26921227b11dc7ffe213daae50208a5
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by an ML classifier and exhibits characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's small size and image-heavy nature further support its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=working+capital+management+problems+and+solutions+pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a1923549e378a5ef942e1fb914b95405/senukexasupopamu.pdf
    • https://tavio.ru/files/file/61450703417.pdf
    • http://akinmedikal.com/uploads/file/55169982034.pdf
    • http://charivne.info/images/file/29045825657.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931454d2f51---pakiwoxem.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/zumabugezupimat.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0049cc890---bibasunoniruwuz.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1ebd3191aa755e7c99a4b56ec7068ba9/wufirezevinebulowigegorob.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074739ae2aaa---62131000521.pdf
    • http://ugyvednok.hu/userfiles/file/papefojakarubituke.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d1cebc46---wukezamolibefudotoket.pdf
    • http://garage-ys.info/js/upload/files/pusafomuponojewilapital.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796d863a563---vixoba.pdf
    • http://marcobernini.it/userfiles/files/52646803806.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2203c79cf---nojovigebe.pdf

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